The goal of this observational study is to gain insight in the natural course of pro-inflammatory factors and hemarthrosis in patients older than 18 with a recent knee trauma. The main question\[s\] it aims to answer are: * What is the natural course of pro-inflammatory factors and hemarthrosis in knee trauma? * What are the effects of inflammation and hemarthrosis on the anti-inflammatory potential of ASC's in order to better determine eligible patients and circumstances for ASC's therapy? Participants will: * undergo blood withdrawal * undergo knee arthrocentesis for synovial fluid sample collection * physical examination * fill out a questionnaire on knee complaints
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Synovial fluid analysis
Timeframe: Samples are taken at week 1, week 2, week 4, week 6 and week 8 after trauma